JPH0751592A - Quantitative feeding apparatus for returned raw concrete discharged from mixer car - Google Patents

Abstract

PURPOSE:To prevent a trouble in a coarse aggregate recovery apparatus from occurring by providing an apparatus which can feeds smoothly and quantitatively returning raw concrete remaining in a concrete mixer car and discharged with a cleaning water into the coarse aggregate recovery apparatus. CONSTITUTION:A rectilinear drainage water receiving conduit 3 the upper face of which is opened to car washing places 1a, 1b and 1c and which has an approximately U-shaped crosssection is supported under a little inclined condition and a ejecting outlet 5 for ejecting pushing water flow toward a drainage water receiving conduit 3 is provided on the upper end part of a slope of the drainage water receiving conduit 3 and an outlet provided on the lower end part of the slope of the drainage water receiving conduit is made to face a coarse aggregate recovery apparatus such as a vibrating screen 6 and a trommel separator. In addition, a bearing 9 is provided in the drainage water receiving conduit 3 to support a screw 10 extending to the outlet in the drainage water receiving conduit 3 and returning raw concrete discharged from a mixer car 2 is gradually fed into a coarse aggregate recovery apparatus in accordance with pushing water flow and rotational movement of the screw 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for quantitatively supplying returned raw concrete remaining in a concrete mixer truck and discharged together with washing water to a coarse aggregate recovering apparatus.

[0002]

2. Description of the Related Art Returned raw concrete discharged along with washing water when the inside of a drum of a concrete mixer truck is conventionally guided to a trommel classifier, a vibrating sieving machine, or a coarse aggregate recovering device such as a slanted cage. Then, the collecting apparatus separates and collects coarse aggregate such as gravel, and then is guided to a fine aggregate collecting apparatus such as a classifier and separates and collects fine aggregate such as sand, which is then placed in a stirring tank. In addition to collecting the supernatant water, the sludge water settled in the stirring tank is sent under pressure to a filter press by a high-pressure pump for dehydration treatment.

By the way, the recycled green concrete discharged from the concrete mixer truck for the above treatment is naturally guided to the coarse aggregate recovering device only by the falling energy due to the inclination of the water collecting gutter without using a pump. In this way, the equipment cost is reduced and troubles such as gravel biting caused by using the pump are prevented. (See Japanese Examined Patent Publication No. 60-21841).

[0004]

However, in the above device,
When a large amount of fresh concrete is discharged from the mixer truck at one time, it flows into the coarse aggregate collecting device as it is, so that there is a problem that the processing capacity is exceeded and a trouble occurs.

Therefore, there is a problem that a coarse aggregate collecting apparatus having a large processing capacity is required, and the equipment cost is rather high.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and supports a straight drain gutter having a substantially U-shaped cross-section whose upper surface is opened in a car wash yard in a gently inclined shape, An outlet for ejecting pressed water toward the inside of the drain gutter is provided at the upper end of the slope of the drain gutter, and an outlet provided at the lower end of the slope of the drain gutter is a vibrating screener, a trommel classifier, etc. Facing the coarse aggregate recovering device, a bearing is provided in the drainage gutter, and a screw extending to the outlet is pivotally supported in the drainage gutter, and the recycled green concrete discharged from the mixer car is used as the pressed water. It is characterized in that the coarse aggregate is gradually supplied to the apparatus according to the rotation of the screw.

[0007]

[Effect] Even if a large amount of raw concrete is returned from the mixer truck to the drainage gutter at a time, the raw concrete is gradually urged by the pushing water and the rotational movement of the screw depending on the processing capacity of the coarse aggregate collecting device. It can be supplied to the coarse aggregate recovery device.

[0008]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a vertical cross-sectional view showing the main part of this constant quantity supply device.
Is a plan view thereof, and FIG. 3 is a sectional view taken along line XX. Further, FIG. 4 schematically shows a flow sheet of the entire processing apparatus. This processing apparatus exemplifies one having a medium processing capacity, and in the figure, 1a, 1b, 1c are car wash rooms having a space capable of stopping three mixer trucks 2.

A straight drainage gutter 3 is supported by a support leg 4 at the rear edge of the car wash yard 1a, 1b, 1c in a gently inclined shape with an inclination angle of about 2 to 10 degrees. As shown in FIG. 3, the drainage gutter 3 has a substantially U-shaped cross section with an open upper surface, and the return green concrete discharged from the mixer truck 2 is received by the drainage gutter 3.

Reference numeral 5 denotes a blow-out port provided at the upper end of the slope of the drain gutter 3, from which blown water can be ejected toward the drain gutter 3.

Reference numeral 6 denotes a vibrating sieving machine which is a coarse aggregate recovering device provided near the car wash yard 1a, 1b, 1c, and an outlet 7 provided at the lower end of the slope of the drain gutter 3 is used as the vibrating sieving machine. It is exposed on the 6 mesh screen.

Further, as shown in FIG. 3, a mounting piece 8 is provided in the middle of the drain gutter 3 so as to extend horizontally inside the drain gutter 3 and a flow gap 8a is formed below the drain gutter 3. Bearing 8 on piece 8
, And one end of a rotating shaft 11 of a screw 10 is rotatably supported by the bearing 9. In addition, screw 1
0 extends right above the outlet 7, and a sprocket 13 is provided at the other end of the rotary shaft 11 of the screw 10, and the sprocket 13 is connected to the rotary shaft of the speed reducer motor 12 via an endless chain 14. ing.

For this reason, washing water is supplied into the drum of the mixer truck 2 stopped at the car wash stations 1a to 1c through the water supply hoses 19a to 19c, and the return concrete in the drum is restored by inclining the drum. At the same time as the cleaning water, it is discharged from the drum and received by the drain gutter 3. Then, pushing water is ejected from the air outlet 5 and the screw 10 is rotated at a low speed in a predetermined direction by driving the motor 12 with a speed reducer, whereby the concrete in the drain gutter 3 is pushed by the pushing water to the drain gutter. 3 is made to flow in the downward tilt direction, and at the same time, the raw concrete is further made to flow in the downward tilt direction of the drainage gutter 3 by pressing by the spiral surface accompanying the rotation of the screw 10, and the vibrating and sieving machine is made from the outlet 7 provided at the lower end of the tilt 6
Drain on top. The pressed water spouted from the outlet 5 dilutes the raw concrete in the drain gutter 3 to enhance its fluidity and prevents the raw concrete from adhering to the inner surface of the drain gutter 3 and the screw 10.

The vibrating sieving machine 6 is provided directly above the sludge tank 15, and the coarse aggregate such as gravel captured on the sieving net of the vibrating sieving machine 6 is discharged from the classifying port 16 onto the belt conveyor 17. , And is transported to the collected gravel storage area 18. Further, sludge water containing fine aggregate such as sand passes through a sieving net, settles in the sludge tank 15, and is further sucked up by the sand pump 20 to generate the crusher 21 as shown in FIG.
Sent to.

As shown in FIG. 4, the classifier 2
1 discharges the sand separated from the sludge water to the recovery sand storage area 22. Further, the sludge water passes through the pipe 23 and is stored in the stirring tank 24. Then, the sludge water settled in the stirring tank 24 is sucked up by the pump 25 into the receiver tank 26, and further pumped by the high-pressure pump 27 to the filter press 28 to be dehydrated, thereby forming the sludge 29 and being stored in the cake storage 30. . Further, the filtered water discharged from the filter press 28 is stored in the supernatant water tank 31, and the pump 32
Is supplied to the water supply hoses 19a to 19c as washing water for the mixer truck 2 and used as pushing water to be jetted from the blowout port 5.

[0016]

As described above, the quantitative supply device for the recycled ready-mixed concrete according to the present invention makes the ready-mixed concrete discharged to the drainage receiving shaft smoothly and smoothly by the synergistic action of the pressing water and the rotational movement of the screw. In addition to being able to feed, by controlling the number of rotations of the screw, it is possible to always feed an amount commensurate with the processing capacity of the coarse aggregate collecting apparatus. For this reason, there is a beneficial effect that the raw concrete is not supplied at one time and the trouble of the coarse aggregate collecting device is solved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a quantitative supply device for recycled ready-mixed concrete according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a schematic diagram of a flow sheet of the entire processing apparatus.

[Explanation of symbols]

 1a, 1b, 1c Car wash 2 Mixer car 3 Drain gutter 5 Outlet 6 Vibrating sieving machine 7 Outlet 9 Bearing 10 Screw 12 Reducer motor

Claims (1)

[Claims] 1. A straight drainage gutter having a substantially U-shaped cross section with an open upper surface is supported in a car wash yard in a gentle inclined shape, and the inclined upper end of the drainage gutter is directed toward the inside of the drainage gutter. While providing an outlet for ejecting pressed water, the outlet provided at the inclined lower end of the drain gutter is exposed to a coarse aggregate collecting device such as a vibrating sieving machine or a trommel classifier. A bearing is provided to rotatably support a screw extending to the outflow port in the drainage gutter, and the return raw concrete discharged from the mixer truck is gradually supplied to the coarse aggregate collecting device according to the pressed water and the rotating motion of the screw. The constant supply device for the recycled green concrete discharged from the mixer truck.